New York band Vampire Weekend sees its sophomore set, "Contra," debut at No. 1 on the Billboard 200 with 124,000 copies sold, according to Nielsen SoundScan . . . The set is only the 12th independently distributed album to top the Billboard 200 since SoundScan began powering the list in May 1991 . . . "Contra" is the only debut in the top 10 this week, as the second-highest entry comes from Omarion's "Ollusion" at No. 19 with 19,000 copies . . . The Greatest Gainer on the tally, in terms of the biggest unit gain, is Lady Gaga's "The Fame Monster," which rallies from No. 10 to No. 6 with 36,000 (up by more than 4,000 copies), likely thanks to her performance and chat on "The Oprah Winfrey Show" last Friday (Jan. 15).